Bicycle helmet



FIG. 1 is a perspective view of a bicycle helmet that embodies my new design.

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof, the right side view being a mirror image of the left side view;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof. 

The ornamental design for a bicycle helmet, as shown. 